The main difference between GT38M and GT38N

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1. General

Giant Electric strives to bring our customers the latest technology and competitive pricing and best service for distribution automatic.

The GT series automatic circuit reclosers can use on overhead distribution lines as well as distribution substation applications for all voltage classes 11kV up to 38kV at 50/60HZ power system. and its rated current can reach 1250A.

The GT series automatic circuit reclosers integrates the functions of control, protection, measurement, communication, fault detection, on-line monitoring of closing or opening.

2. Service environment
a) Air temperature: Maximum temperature: +85℃; Minimum temperature:-45℃

b) Humidity: Monthly average humidity 95%; Daily average humidity 90% .

c) Altitude above sea level: Maximum installation altitude:2500mor more higher.

d) Ambient air not apparently polluted by corrosive and flammable gas, vapor etc.

e) No frequent violent shake

3. Offering

With optional classes for rated current range:

For 12kV, with630A, 20kA Breaking capacity. 800A, 20kA capacity, and1250A, 25kA.

For 15kV, with630A, 20kA Breaking capacity. 800A, 20kA capacity, and1250A, 20kA.

For 27kV, with630A, 20kA Breaking capacity.800A, 16kA capacity, and1250A, 25kA.

For 38kV, with630A, 20kA,. and expanding1250A, .25kA GT38M type..

With optional classes for installation styles:

Single phase, vacuum recloser and Three phase, vacuum recloser.

With optional relay protection curves for user choice:

Ph.OC1: Current Protection 
Ph.OC2: limit current protection 
Ph.OC3: over-current protection 
IDMTOC: inverse-time overcurrent protection 
SEF: Sensitive earthing fault overcurrent protection 
Reclose: reclosing 
Recl.ACC: Inter-phase Closing acceleration protection 
Manu.ACC: Inter-phase charging protection 
Overload: Overload protection 
NSPTOC1: some Inter-phase negative sequence overcurrent 
NSPTOC2: Inter-phase negative sequence overcurrent protection, Sec. 
PH.OV: over-voltage protection 
PH.UV: Low voltage protection 
Resi.OV: zero sequence overvoltage protection 
Hi.Gas: heavy gas protection 
Hi.Temp: High temperature protection 
Com.Val: common values

More relay functions can be customized.

With optional choice by locally or remotely.

With optional communication protocols & I/O port for user choice:

RS-232 and RS-485 ports supporting.

DNP3.0 communication protocol support(*).

Modbus communication protocol is optional(*).

IEC 60870-5-101 communication protocol support.

IEC 60870-5-104 communication protocol support. (*).

The recloser can communicate through GPRS(Or GSM) modem with English or Chinese languege (*).With optional functions for user.

Rated currents, System phase current.

Rated voltages, System phase voltage& secondary low voltage power supply voltage.

Frenquency, power(kWh), reactive power(kVarh),power factor .

With optional reclosing interval for user pre-program:

Reclosing times setting support.

Dead time setting support.

With events recording function:

SOE 1000 operations record.

Fault record and normal operation record.

Note: (*) mean should customized by manufacturer if needed.

4. Recloser feature

4.1 Outline of recloser:

The GT series vacuum recloser is mainly combined with integration terminal, current transformer, permanent magnetic actuator and its recloser controller.

4.2 The recloser tank feature:

The Vacuum recloser tanks are manufactured from 304 grade stainless steel and are powder coated

a light grey colour.

Whole recloser IP65 protection class, equipped with a auxiliary plug to connect with recloser controller by control cable, Diameter Max22mm,6 Mlength(8Mfor special). .

Its can performance serve more than 20 years long term under heavy duty circumstance.

4.3 The recloser vacuum embedded pole feature:

The recloser’s vacuum interrupter insert in an epoxy resin solid pole, and external coated with a high reliable, stable material:Fluorocarbon silicone rubber (γ-trifluoro propyl methyl polysiloxane)

With excellent electric insulation, weather resistance, ozone, biological inertia, can be stand under the long-term use in -55 ~ +200℃.

Creepage Distances of GT

T to T*   -----Terminal to terminal creepage

T to G/E* -----Terminal to ground/earth creepage